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@alluded gitarre @anni @hijita NATHANIEL K. LYNCH, OF NEW YORK, Y.

Lette/rs Patent No. 101,634, dated April 5, 1870.

VARIABLE CUT-OFF-VALVE GEAR.

Owo--w The Schedule referred to in these Letters Patent and making partof the same To all whom it 'may concern:

Be it known that I, NATHANIEL K. LYNCH, of the city, county and State ofNew York, have invented a new and improved Cut-oli' Gear forSteam-Engines, of which the following is a full,` clear, and exactdescription, reference being had to the accompanying drawing formingpart of this specification, and in which- Figure 1 represents a iont orone-side elevation of my improved cut-oli' gear.

Figure 2 a vertical section of the same, taken, as indicated, in theline x a; in fig. 1, and

Figure 3 a holizont-al section thereof, taken, as denoted, by the line yy in iig. 2.

Similar letters of reference indicate -corresponding parts.

The object of this invention is to convert into a variable cut-olf, anordinary throttle-valve, or any valve which, like it, is used outside ofthe engine to regulate the supply of steam to the steam-chest of theengine.

It consists in certain means, which, under ordinary speeds of theengine, operate to eiect a full opening of the governor-valve, and avaried closing of the same-during each stroke of the engine, suchvariation, in closing, being regulated by the speed of the enginethrough the action of the governor.

When the engine has a tendency lto run at an eX- treme speed, tast orslow, said valve maybe wholly closed, or kept wholly or longer open.

Referring to the accompanying drawing- -A represents a frame that isused to carry my improved cut-of gear, and l B a horizontal rock-shaft,supported by said frame, and which may be operated by a slotted crank orarm, C, through an eccentric on the main shaft of the en- This shaft Bcarries toes D D, which serve, as the rock-shalt is vibrated, to actagainst lifters E E, arranged to project from a vertically-sliding rod,F, that is suitably guided in its play through the frame A, and mayAhave its stroke adjusted to give any rcquiredpositive set or motion tothe cut-off by means of the slotted connection of the driving eccentricwith the crank or arm O. v

The lift of said rod F takes place in the early part of each stroke ofthe engine, for the purpose of lifting a rod, G, to open the throttle orgovernor-valve with which it is connected, said rod in its lift openingsaid valve to give a full. head or supply of .steam to the engine earlyin the stroke, and, when relieved from lift, which occurs at variousperiods during the stroke, as regulated by the governor, dropping by itsown weight, or by weight attached to it, or connected with the valve, toclose the latter so as to shut olf the operation of the rod F, onto atable or stop, H, con--V nected with the frame A., to secure the closingof the valve.

Its lift, to open the`valve, is effected by jaws or levers I I, pivoted,as at a a, to a platform, J, carried by the rod F, and through which thevalve-rod G is free to play.

These jaws are closed by a spring, K, applied to their hack ends, andserve,v during the lift of the platform J by t-he rod F, to raise thevalve-rod G to open the valve, by clipping said rod G under shoulders bb formed thereon, and said jaws are opened at different periods in thelift of the rod F to allow of the rodG dropping through them onto thetable H to close the valve. The period of opening the jaws, thereibre,controls the time of shutting olf the supply of steam during the strokeof the engine, and this is regulated by the governor through a verticalbar, L, ot'a wedge form at its lower end c, which fits an opening in orbetween the jaws, and which, accordingly as it is raised or lowered bythe action of the governor, (an increase in the speed of the enginelowering it and a decrease in thc speed raising it,) serves to open thejaws I Isooner or later in their upward travel,'along with the rod F, bythe pressure of said jaws against and over the sides of the wedge c ofthe bar L, and thus cause the valve-rod G to drop sooner or later in thestroke ofthe engine and close the va-lvc.

The do\vn-.st1'okc of the rod F and jaws I I is such as always to bringthe latter, when at the bottom of their stroke, under the shoulders b bof the valve-rod G, to secure its lift, although, under a tendency ofthe engine to run at an extreme quick speed, the har L is designed to belowered to an extent that will cause its wedge c to keep open the jaws,so that, as the latter are lifted, they will not grip the valve-rod orbite on it under the shoulders l) b, which causes the valve to remainclosed. Likewise, under an extremely slow speed of the engine, it isintended that the governorhar L should be soaised as to exert no openingaction on the jaws, which will givc a positive or n'xed action to thevalve independently of the =governor, and exclusively' by the operationof the rod F,which action does away with the closing of the valve duringthe stroke of the engine, or only slowly closes the sume toward theendof the stroke thereof. l

The bodies of the valve-rod G and governor-bar L,

v I, arranged to receive a. positive lip-and-down motion from theengine, the drop-rod G connected with` the valve designed to beVcontrolled by the governor, and the bar L for operation by thegovernor7 and constructed to h ave an opening action on the jaws,substantially as specified.

NATHL. K. LYNCH.

Witnesses HENRY T. BROWN, HENRY PALMER.

